ADE9078 datasheet(21/108 Pages) AD

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ADE9078

Data Sheet

Rev. 0 | Page 20 of 107

TERMINOLOGY

Differential Input Voltage Range and Maximum Operating

Voltage on VxP, VxN, IxP, and IxN Analog Input Pins

The differential input range describes the maximum difference

between the IxP and IxN or VxP and VxN pins. The maximum

operating voltage given in Table 1 describes the maximum

voltage that can be present on each pin, including any common-

mode voltage. Figure 28 illustrates the maximum input between

xP and xM, which is seen in the application when a current

transformer with center tapped burden resistor is used. Figure 29

illustrates the maximum input voltage range between xP and xN

when a pseudo differential input is applied, as is commonly

seen when sensing the line voltage.

+0.1V

+0.6V

–0.4V

0x0474 E650 =

+74,770,000

0xFB8B 19B0 =

–74,770,000

CHANNEL (x_PCF) WAVEFORM

DATA RANGE WITH x_GAIN = 1

xP INPUT PIN

xM INPUT PIN

+0.1V

+0.6V

–0.4V

Figure 28. Maximum Input Signal with Differential Antiphase Input with

Common-Mode Voltage = 0.1 V Gain = 1

+0.1V

+0.6V

-0.4V

+0.1V

0x0474 E650 =

+74,770,000

0xFB8B 19B0 =

–74,770,000

CHANNEL (x_PCF) WAVEFORM

DATA RANGE WITH x_GAIN = 2

xP INPUT PIN

xM INPUT PIN

Figure 29. Maximum Input Signal with Pseudo Differential Input with

Common-Mode Voltage = 0.1 V, Gain = 2 (x_GAIN = 2)

Crosstalk

Crosstalk is measured by grounding one channel and applying a

full-scale 50 Hz or 60 Hz signal on all the other channels. The

crosstalk is equal to the ratio between the grounded ADC output

value and its ADC full-scale output value. The ADC outputs are

acquired for 100 sec. Crosstalk is expressed in decibels.

Differential Input Impedance (DC)

The differential input impedance represents the impedance

between the pair IxP and IxN or VxP and VxN. It varies with

the PGA gain selection as indicated in Table 1.

ADC Offset

ADC offset is the difference between the average measured

ADC output code with both inputs connected to GND and the

ideal ADC output code of zero. ADC offset is expressed in

microvolts.

ADC Offset Drift over Temperature

The ADC offset drift is the change in offset over temperature.

It is measured at −40°C, +25°C, and +85°C. The offset drift over

temperature is computed as follows:









































max

Offset

Drift

Offset drift is expressed in μV/°C.

Gain Error

The gain error in the ADCs represents the difference between the

measured ADC output code (minus the offset) and the ideal

output code when an external voltage reference of 1.2 V is used (see

the Voltage Reference section). The difference is expressed as a

percentage of the ideal code. It represents the overall gain error

of one channel.

Gain Drift over Temperature

This temperature coefficient includes the temperature variation

of the ADC gain while using an external voltage reference of

1.2 V. It represents the overall temperature coefficient of one

current or voltage channel. With an external voltage reference

of 1.2 V in use, the ADC gain is measured at −40°C, +25°C, and

+85°C. Then the temperature coefficient is computed as follows:







 













































(

max

Gain

Drift

Gain drift is measured in ppm/°C.

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